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Title: Impact of Triethanolamine as an Additive for Rechargeable Alkaline Zn/MnO 2 Batteries under Limited Depth of Discharge Conditions

Rechargeable alkaline Zn/MnO 2 batteries are being developed for use as cost-effective grid-scale energy storage devices. Previous studies have shown that limiting the depth of discharge (DOD) of the MnO 2 cathode extends cell lifetime while still providing a cost-effective battery system. Herein, a comprehensive study of triethanolamine (TEA) as an additive in Zn/MnO 2 limited DOD batteries is provided by examining the effect of TEA in full cells as well as independently on the cathode, anode, separator, and electrolyte. Improvement in cycle-ability of the cathode (on average, 80% of cycled capacity remains after 191 cycles without TEA, 568 cycles with TEA) and a decrease in ionic zinc mobility across Celgard 3501 (7.91 × 10 -5 cm 2/min without TEA, 3.56 × 10 -5 cm 2/min with TEA) and Cellophane 350P00 (3.26 × 10 -5 cm 2/min without TEA, 4.74 × 10 -6 cm 2/min with TEA) separators upon the addition of TEA are demonstrated. However, TEA increased both the reduction potential of Zn (-0.68 V vs. Hg/HgO without TEA, -0.76 V with TEA) and the solubility of Zn 2+ (0.813 M without TEA, 1.023 M with TEA). Overall, the addition of TEA extended the lifetime of limited DOD cellsmore » on average by 297%.« less
Authors:
 [1] ;  [1] ; ORCiD logo [1] ;  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Dept. of Materials, Devices, and Energy Technologies
Publication Date:
Report Number(s):
SAND2018-3127J
Journal ID: ISSN 0013-4651; 661715
Grant/Contract Number:
NA0003525
Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 164; Journal Issue: 14; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Electricity Delivery and Energy Reliability (OE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; additive; batteries
OSTI Identifier:
1432475